COMMERCIAL ITEM DESCRIPTION A-A-50804A
The mixing action shall be the result of an eccentric motion of the motor driven receptacle cup. The mixing in a test tube shall be by manually positioning the test tube in a cavity in the top of the cup receptacle. The mixing on other vessels (e.g., flasks, beakers and odd shaped containers) shall be by manually holding such vessels against the side of the cup receptacle. The motion of the cup receptacle shall cause a whirlpool motion for the liquid contents of the test tube, and a turbulence for liquid contents of other vessels held against the side of the cup receptacle.
There shall be adequate clearance between the cup receptacle and base to preclude any contact during the operation of the laboratory mixer.
The on-off switch shall control the operation of the laboratory mixer for either continuous or intermittent mixing. The ”on” position shall permit a continuous motor operation. With the switch in the “off” position, the motor operation shall be controlled by a pressure activation switch which shall be in the form of either:
1. An internally mounted switch that is activated by external pressure being applied to the cup receptacle and then deactivated by the release of the external pressure.
2. A hand operated extended touch plate.
The variable speed control shall be in the form of a multi-position switch for stepless changes in speed.
Two sponge strips or four rubber feet shall be securely attached to the underside of the base. The exterior housing of the base shall have a suitable finish that is resistant to corrosion or scratching.
The line cord shall be three conductor (with ground lead) and shall terminate with a three blade male plug for use in receptacles specified in American National Standards Institute (ANSI) C73.11.
During operation, the laboratory mixer shall operate without any type of failure, and shall show no tendency to creep.
Workmanship. The laboratory vortex mixer shall be free from defects which detract from its appearance or impairs its serviceability.
Unit. Each (EA). One vortex mixer, as specified, constitutes one unit.
Quality Assurance Provisions.
Responsibility for inspections. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.
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